Cupola
Cupola means a large, water-cooled metal vessel to which is charged a mixture of fuel, rock and/or slag, and additives. As the fuel is burned, the charged mixture is heated to a molten state for later processing to form mineral wool.
Source
40 CFR § 63.1196
Scoping language
Terms used in this subpart are defined in the Act, in 63.2 of the general provisions in subpart A of this part, and in this section as follows: